/Engine/Plugins/Animation/ControlRig/Source/ControlRig/Public/ControlRigGizmoActor.h
This returns root component transform based on attach when there is no attach, it is based on 0
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="ControlRig|Shape") void SetGlobalTransform ( const FTransform & InTransform )